audit: type=1400 audit(1566016456.012:8): avc:  denied  { prog_load } for  pid=1788 comm="syz-executor105" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=bpf permissive=1
audit: type=1400 audit(1566016456.052:9): avc:  denied  { prog_run } for  pid=1788 comm="syz-executor105" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=bpf permissive=1
==================================================================
BUG: KASAN: use-after-free in ____bpf_clone_redirect net/core/filter.c:1768 [inline]
BUG: KASAN: use-after-free in bpf_clone_redirect+0x2a7/0x2b0 net/core/filter.c:1759
Read of size 8 at addr ffff8881d0506a90 by task syz-executor105/1788

CPU: 0 PID: 1788 Comm: syz-executor105 Not tainted 4.14.139+ #33
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0xca/0x134 lib/dump_stack.c:53
 print_address_description+0x60/0x226 mm/kasan/report.c:187
 __kasan_report.cold+0x1a/0x41 mm/kasan/report.c:316
 ____bpf_clone_redirect net/core/filter.c:1768 [inline]
 bpf_clone_redirect+0x2a7/0x2b0 net/core/filter.c:1759
 ___bpf_prog_run+0x2478/0x5510 kernel/bpf/core.c:1033

Allocated by task 1788:
 save_stack mm/kasan/common.c:76 [inline]
 set_track mm/kasan/common.c:85 [inline]
 __kasan_kmalloc.part.0+0x53/0xc0 mm/kasan/common.c:495
 slab_post_alloc_hook mm/slab.h:439 [inline]
 slab_alloc_node mm/slub.c:2758 [inline]
 slab_alloc mm/slub.c:2766 [inline]
 kmem_cache_alloc+0xd2/0x2e0 mm/slub.c:2771
 kmem_cache_alloc_node include/linux/slab.h:361 [inline]
 __alloc_skb+0xea/0x5c0 net/core/skbuff.c:193
 alloc_skb include/linux/skbuff.h:980 [inline]
 nlmsg_new include/net/netlink.h:511 [inline]
 audit_buffer_alloc kernel/audit.c:1626 [inline]
 audit_log_start kernel/audit.c:1740 [inline]
 audit_log_start+0x292/0x6d0 kernel/audit.c:1690
 common_lsm_audit+0xd3/0x1d50 security/lsm_audit.c:452
 slow_avc_audit+0x14b/0x1e0 security/selinux/avc.c:771
 avc_audit security/selinux/include/avc.h:141 [inline]
 avc_has_perm+0x2d1/0x350 security/selinux/avc.c:1146
 selinux_bpf+0xbe/0x110 security/selinux/hooks.c:6317
 security_bpf+0x7c/0xb0 security/security.c:1721
 SYSC_bpf kernel/bpf/syscall.c:1580 [inline]
 SyS_bpf+0x145/0x3830 kernel/bpf/syscall.c:1563
 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
 0xffffffffffffffff

Freed by task 31:
 save_stack mm/kasan/common.c:76 [inline]
 set_track mm/kasan/common.c:85 [inline]
 __kasan_slab_free+0x164/0x210 mm/kasan/common.c:457
 slab_free_hook mm/slub.c:1403 [inline]
 slab_free_freelist_hook mm/slub.c:1430 [inline]
 slab_free mm/slub.c:3005 [inline]
 kmem_cache_free+0xcb/0x340 mm/slub.c:3021
 kfree_skbmem net/core/skbuff.c:586 [inline]
 kfree_skbmem+0xa0/0x110 net/core/skbuff.c:580
 __kfree_skb net/core/skbuff.c:646 [inline]
 kfree_skb+0xeb/0x370 net/core/skbuff.c:663
 kauditd_hold_skb+0x112/0x140 kernel/audit.c:543
 kauditd_send_queue+0x102/0x140 kernel/audit.c:702
 kauditd_thread+0x4de/0x6a0 kernel/audit.c:828
 kthread+0x31f/0x430 kernel/kthread.c:232
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:404
 0xffffffffffffffff

The buggy address belongs to the object at ffff8881d0506a00
 which belongs to the cache skbuff_head_cache of size 224
The buggy address is located 144 bytes inside of
 224-byte region [ffff8881d0506a00, ffff8881d0506ae0)
The buggy address belongs to the page:
page:ffffea0007414180 count:1 mapcount:0 mapping:          (null) index:0x0
flags: 0x4000000000000200(slab)
raw: 4000000000000200 0000000000000000 0000000000000000 00000001800c000c
raw: dead000000000100 dead000000000200 ffff8881dab70200 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881d0506980: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8881d0506a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8881d0506a80: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
                         ^
 ffff8881d0506b00: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
 ffff8881d0506b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================